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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Peter Huewe <peterhuewe@gmx.de>
Cc: tpmdd-devel@lists.sourceforge.net,
	"Michal Suchánek" <msuchanek@suse.de>,
	linux-security-module@vger.kernel.org
Subject: Re: [tpmdd-devel] [PATCH RESEND 3/3] tpm-chip: Export TPM device to user space even when startup failed
Date: Wed, 30 Aug 2017 14:10:19 +0300	[thread overview]
Message-ID: <20170830111019.bsd2jod7z2v2jeoi@linux.intel.com> (raw)
In-Reply-To: <4722067A-082C-40E7-90ED-29EFB3228765@gmx.de>

On Wed, Aug 30, 2017 at 12:41:51PM +0200, Peter Huewe wrote:
> 
> 
> Am 30. August 2017 12:15:10 MESZ schrieb Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>:
> >On Tue, Aug 29, 2017 at 03:17:39PM +0200, Michal Suchánek wrote:
> >> Hello,
> >> 
> >> On Tue, 29 Aug 2017 15:55:09 +0300
> >> Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> wrote:
> >> 
> >> > On Mon, Aug 28, 2017 at 05:15:58PM +0000,
> >> > Alexander.Steffen@infineon.com wrote:
> >> > > But is that just because nobody bothered to implement the
> >necessary
> >> > > logic or for some other reason?  
> >> > 
> >> > We do not want user space to access broken hardware. It's a huge
> >risk
> >> > for system stability and potentially could be used for evil
> >purposes.
> >> > 
> >> > This is not going to mainline as it is not suitable for general
> >> > consumption. You must use a patched kernel if you want this.
> >> > 
> >> > /Jarkko
> >> > 
> >> 
> >> It has been pointed out that userspace applications that use direct
> >IO
> >> access exist for the purpose. So using a kernel driver is an
> >> improvement over that if the interface is otherwise sane.
> >> 
> >> What do you expect is the potential for instability or evil use?
> >
> >By definition the use of broken hardware can have unpredictable
> >effects.
> >Use a patched kernel if you want to do it.
> 
> If the s.m.a.r.t selftest of your hard disk fails, you can still
> access it, even though the hw selftest says it is broken.
> Same situation.

Not sure if you can compare these directly although I get your point.

Waiting for more comments on this. At the moment I'm still dilated to
restricted access because it gives more variables for the future.

/Jarkko

  reply	other threads:[~2017-08-30 11:10 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-24  8:37 [PATCH RESEND 0/3] Export broken TPMs to user space Alexander Steffen
     [not found] ` <20170824083714.10016-1-Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w@public.gmane.org>
2017-08-24  8:37   ` [PATCH RESEND 1/3] tpm-chip: Move idr_replace calls to appropriate places Alexander Steffen
2017-08-25 17:25     ` Jarkko Sakkinen
     [not found]       ` <20170825172546.f4bl2wh7tgbyjx2n-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-08-28 17:18         ` Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w
2017-08-24  8:37   ` [PATCH RESEND 2/3] tpm-chip: Return TPM error codes from auto_startup functions Alexander Steffen
     [not found]     ` <20170824083714.10016-3-Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w@public.gmane.org>
2017-08-25 17:06       ` Jarkko Sakkinen
     [not found]         ` <20170825170607.wfnr5y5zres2n42r-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-08-29 12:11           ` Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w
2017-08-24  8:37   ` [PATCH RESEND 3/3] tpm-chip: Export TPM device to user space even when startup failed Alexander Steffen
2017-08-25 17:20     ` Jarkko Sakkinen
     [not found]       ` <20170825172021.lw3ycxqw63ubrcm2-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-08-28 17:15         ` Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w
2017-08-29 12:55           ` Jarkko Sakkinen
2017-08-29 13:17             ` [tpmdd-devel] " Michal Suchánek
     [not found]               ` <20170829151739.315ae581-6hIufAJW0g4CVLCxKZUutA@public.gmane.org>
2017-08-29 13:53                 ` Peter Huewe
2017-08-30 10:26                   ` [tpmdd-devel] " Jarkko Sakkinen
2017-08-30 10:15                 ` Jarkko Sakkinen
2017-08-30 10:20                   ` [tpmdd-devel] " Jarkko Sakkinen
2017-08-30 10:34                     ` Michal Suchánek
2017-08-30 11:07                       ` Jarkko Sakkinen
2017-08-31 16:18                         ` Alexander.Steffen
2017-09-02 10:20                           ` Jarkko Sakkinen
     [not found]                   ` <20170830101510.rlkh2p3zecfsrhgl-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-08-30 10:41                     ` Peter Huewe
2017-08-30 11:10                       ` Jarkko Sakkinen [this message]
2017-08-31 16:26                         ` [tpmdd-devel] " Alexander.Steffen
2017-09-02 10:24                           ` Jarkko Sakkinen

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